high revving ls1?

**nmssr08** · 10-07-2008, 04:00 AM

1. how high can ls1 rev to with internal mods?

2. what is needed to achieve this type of rpm?

3. will the engine still be street capable?

4. what is the highest rpm you saw/heard on ls1?

5. do you have any video link?

thanks in advance.......

**Spaz** · 10-07-2008, 06:03 AM

why do you want a really high reving LS1???

**nmssr08** · 10-07-2008, 06:13 AM

Originally Posted by Spaz

why do you want a really high reving LS1???

just wondering. i was going through a magazine and the new M3 can rev pretty high for a v8( i think in the 8K range....) so i thought why not ls1?...... thats all.

it would be pretty crazy to hear ls1 rev to 8500rpm or so....haha.

**Spaz** · 10-07-2008, 06:24 AM

it would all depend on the internals... certain cams like a MS4 are high reving cams... the valve train would have to match that cam...

**nmssr08** · 10-07-2008, 11:15 AM

Originally Posted by Spaz

it would all depend on the internals... certain cams like a MS4 are high reving cams... the valve train would have to match that cam...

i see.... does it require changing out the crank too? some say ls1 crank is good for 8K rpm......

**Mr. Luos** · 10-07-2008, 11:31 AM

I wouldn't want to take the stock shortblock above 6800 regularly.

If I was looking for a high revving LS1...I would probably de-stroke it a bit (down a few cubes) but safely spin to 8500 or so. Just need a cam and valvetrain to spin it that high.

I spin my 402 LSx to 6700.

**LT1 > LS1** · 10-07-2008, 11:44 AM

you need heads with a lot of velocity. the bmw can get away with the high rpm's due to the tiny stroke.

think about it.....the smaller a motor gets, the better it revs (usually)

chevy 350.....not so great

chevy 327 .....pretty good

honda 4 cylinder real good

sport bike engine.......WOW

nitro rc car motor...... 40,000 rpm.....yes forty thousand.

overall you need rods that wont stretch, good studs and bolts, and you need light valavetrain, and a great flowing head.

**9T8W66** · 10-07-2008, 01:26 PM

This thread reminds me of something.
Any of you old enought to remember the Original Z28 engine `67-69 ?
The Old 302 which was a 327 block (4.00" bore) 283 crank (3.00" stroke).
It had the 2.02" 1.60" valved 327 Fuelie heads, 11.75;1 compression, a Solid lifter 254/254 @ .050 with 485 lift Bumpstick, Aluminum dual plane Highrise with a big 780 cfm Holley. Rated at 290 HP (made closer to 350) and would spin to well above 7000 rpm. It actually didn't make any power below 3500 rpm. BTW only transmission available was a Muncie 4spd and the standard gear set was 3.73 (should of been 4.88's).

**Marc 85Z28** · 10-08-2008, 08:48 AM

My shift points are set at 7100rpm (peak power at 6900rpm) and my combo isn't anything special. Just a heads and cam setup with some quality lifters/valvesprings and ARP rod bolts in a stock bottom end.

Six Speeds Inc I believe has a naturally aspirated ~440" LSx turning well over 9000rpm. Check YouTube for the video.

**TempleU_WS6** · 10-08-2008, 12:28 PM

Originally Posted by nmssr08

just wondering. i was going through a magazine and the new M3 can rev pretty high for a v8( i think in the 8K range....) so i thought why not ls1?...... thats all.

it would be pretty crazy to hear ls1 rev to 8500rpm or so....haha.

The new M3 revs that high cause like was was said, it has a smaller displacement. Its only 4.0 Liters with a 12:0:1 comp ratio. Makes a nice 414 hp at 8,300 rpm but a low 295 lb-ft of torque at 3,900 rpm. At least is consistent, (85% of the maximum torque available through 6,500 rpm).

Its possible to wind out an LS motor that high buts its gonna cost some coin.

**iam_dale** · 10-08-2008, 12:41 PM

Originally Posted by 9T8W66

This thread reminds me of something.
Any of you old enought to remember the Original Z28 engine `67-69 ?
The Old 302 which was a 327 block (4.00" bore) 283 crank (3.00" stroke).
It had the 2.02" 1.60" valved 327 Fuelie heads, 11.75;1 compression, a Solid lifter 254/254 @ .050 with 485 lift Bumpstick, Aluminum dual plane Highrise with a big 780 cfm Holley. Rated at 290 HP (made closer to 350) and would spin to well above 7000 rpm. It actually didn't make any power below 3500 rpm. BTW only transmission available was a Muncie 4spd and the standard gear set was 3.73 (should of been 4.88's).

Word I got on 'em was that you had to put it in neutral, punch the throttle, and wait 5 minutes for the dayum thing to blow up!!

dale

**Midnight02** · 10-08-2008, 02:10 PM

Great question. There are plenty of guys that are revving in the 6800 - 7000 rpm range and I'm sure you will likely find an occassional example of a build that could go to 8000 - 9000 rpm. That being said, most of the folks on this site are probably spinning somewhere between the stock redline and 7000 rpm.

Personally, I have a typical H/C/I setup and have the drivetrain mods to support it and I make my max power at 6400 rpm and usually shift right around 6500 rpm. Frankly, by 6500 rpm with the cutout open I couldn't even begin to imagine what it would sound like if I stayed in it much longer.

**nmssr08** · 10-08-2008, 08:23 PM

thanks for the info guys. i see that it is possible to have ls1 rev high but i guess the torque is gonna drop and it cost a lot of money. revving to 8500 rpm sounds fair enough and i guess changing rods/pistons are always better for extra protection..... what parts brand is good for this type of build? any particular brand you all recommend?

**ss~zoso~ss** · 10-09-2008, 04:44 AM

i think the m3 is able to do so also because it doesnt use pushrods and such

**Marc 85Z28** · 10-09-2008, 03:08 PM

Originally Posted by nmssr08

thanks for the info guys. i see that it is possible to have ls1 rev high but i guess the torque is gonna drop and it cost a lot of money. revving to 8500 rpm sounds fair enough and i guess changing rods/pistons are always better for extra protection..... what parts brand is good for this type of build? any particular brand you all recommend?

You'll need A LOT more than just rods and pistons to spin 8500+ rpm.

**Spaz** · 10-09-2008, 03:26 PM

Originally Posted by nmssr08

thanks for the info guys. i see that it is possible to have ls1 rev high but i guess the torque is gonna drop and it cost a lot of money. revving to 8500 rpm sounds fair enough and i guess changing rods/pistons are always better for extra protection..... what parts brand is good for this type of build? any particular brand you all recommend?

i'd would want to rev that high... if anything get a cam, valve train components and heads and adjust your rev limiter to that cam so you can drop back in to peak HP range with out loss... reving high like that will more than likely put you on the down fall of your HP range and you will run slower times all together unless you have a massive cam...

**LT1 > LS1** · 10-10-2008, 10:31 AM

also, you can get more revs with lighter weight.

you would need a lightweight crank, aluminum rods, and titanium valvetrain to spin that high and let the motor survive.

if you are serious about it.....Callies makes some badass crankshafts. I believe GRP makes custom billet I beam rods ($100+ each) and venolia makes really badass custom pistons.

of course with that bottom end....you woill be sittin on a easy $7,000+ for the roating assembly parts.....that doenst include the extreme duty block of your choice, or machine work......

**Eric1987** · 10-10-2008, 04:07 PM

Realistically what would it take to even get my redline at 6300? And power benefits?

**Bottesini** · 10-10-2008, 04:31 PM

Originally Posted by Eric1987

Realistically what would it take to even get my redline at 6300? And power benefits?

I shift between 6500-6800. Only things that where needed, exhaust, lid, cam (226/228 .585/.588 lsa 112), and a tune. The 02s have a better rod bolt then the 99s from what I understand but just getting a little more RPM is not that hard. However, you don't really get much of a gain unless you have the parts to make power up there.

**nmssr08** · 10-11-2008, 11:11 AM

thanks everyone for the great info. I don't think I want to spend over $5000 to build my motor...... quality parts are always good.....but if there are more cons than pros to rev high, i don't think i want to proceed with a build. i guess getting a good amount of HP/TQ will make up for the high rev anyway right?